How to strip trailing whitespace in CMake variable?

Question

We are trying to improve the makefiles produced by CMake. For Clang, GCC and ICC, we want to add -march=native. The block to do so looks like:

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Answer 1

This strips terminating newline in the variable :

string(REGEX REPLACE "\n$" ""  "${}")

Works for one of the project I involved to since CMake 2.8.